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diff --git a/content/know/concept/lagrange-multiplier/index.pdc b/content/know/concept/lagrange-multiplier/index.pdc
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@@ -122,3 +122,6 @@ $$\begin{aligned}
1. G.B. Arfken, H.J. Weber,
*Mathematical methods for physicists*, 6th edition, 2005,
Elsevier.
+2. O. Bang,
+ *Applied mathematics for physicists: lecture notes*, 2019,
+ unpublished.